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The other key element to the Street Thrasher combo is a stroker package. Dropping in a 3.75-inch stroke crank will get you the magical 5.0 liters, and MMR's stroker package includes a forged crank, forged H-beam rods, and forged pistons in the compression you choose. The assembly also includes bearings and has been balanced prior to shipping. Clochiatti said this bottom end will support up to 850 hp. In this photo are some of the piston and rod combinations for stock and long-stroke builds. So far everything we've mentioned for the 4.6 will also work for a 5.4 engine except the stroker package. Clochiatti said MMR does not recommend building a 5.4 stroker engine because the geometry creates too great a side load on the cylinders. If you want to add displacement to a 5.4 block, you're going to have to sleeve it.